The Terps' 2021 slate features matchups against nine of 20 teams from last year's NFHCA Division I Coaches poll.
Tornetta was announced as a transfer for the Terps on May 28.
The Terps struggled to keep the 49ers silent, allowing runs in six straight innings.
Tornetta spent her first three seasons with Princeton where she appeared in back-to-back Final Fours.
Donraadt hails from Rotterdam, Netherlands, where she showed exceptional skill at a young age.
Maryland sports teams have won national championships and Big Ten tournament titles.
The Terps could miss the NCAA tournament for the first time since 1994.
The Terps did not register a shot on goal.
The No. 4-seed Terps will face the No. 5-seed Iowa Hawkeyes on Wednesday for a spot in the semifinals.
The Terps snapped a three-game losing streak and entered the Big Ten tournament on a high note.